微电解法对废水脱氮处理的研究

Degeneration treatment of wastewater with micro-electrolysis

为解决传统生物脱氮工艺存在的流程长、运行费用高、脱氮率低等问题,采用微电解法对高含氮废水脱氮处理进行研究.在原电池的基础上,用铁炭微电解法对NO2^--N进行还原到氮气,最终达到废水脱氮的目的.着重分析pH、m（Fe）/m（C）、反应时间、混凝条件等反应条件对NO2^--N和TN去除率的影响.同时,从经济效益方面与传统脱氮工艺进行分析比较.结果表明：微电解法控制进水pH为1.5-3.0,水力停留时间为60 min,m（Fe）/m（C）为1.1∶1.0,混凝pH为8.5-9.0和沉降时间为40 min时,NO2^--N的去除率可高达75%以上,TN的去除率可达52%左右.微电解法对各种高含氮废水的脱氮处理是切实可行的,并且用废刚玉粉末取代活性炭,可以获得以废治废的环境效益和经济效益.

Aiming at the long flow with high operating cost and low removal efficiency in traditional biological process of denitrification, the micro-electrolysis technology was employed to treat the ammonium-rich wastewater. The NO2^- -N was deoxidized to nitrogen gas by ferric-carbon micro-electrolysis based on the mechanism of galvanic battery, thus the nitrogen was removed from wastewater. The influence of reaction conditions, including pH, Fe/C （mass ratio）, reaction time, and coagulation condition, on the removal rate of NO2^- - N and TN was analyzed. The results show that the removal rate of NO2^- - N is up to 75% and that of TN is about 52% with micro-electrolysis technology under following reaction conditions： pH. value of 1.5 - 3.0, reaction time of 60 min, Fe/C （mass ratio） of 1. 1 ： 1.0, coagulation pH value of 8.5 - 9.0, and coagulation time of 40 min. Thus it is feasible to treat ammonium-rich wastewater by Ferric-Carbon Micro-Electrolysis. And using waste corundum graphite powder instead of activated carbon is using waste to treat waste, which can obtain favorable environmental and economic benefits.